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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc1badb11f6aaaf082d83daae518cf0d923101a0a7e62bb1816f47b08574c6c0' 
  AND token = 'i0gloqufd/xumCwCr+SqskGCrHfrOqsupQpdjz66m4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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