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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f62d3ac6ba42b0784bf0e1bea0149f5e6a65baad4bc9fe4e450e0f78d93e1ec8' 
  AND token = 'vIXfkEaTerboU6zhy4sPmpFxI59IZifkl6BN8rkUIOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}