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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6bae8bf4b3a48c0c0e7c59a95e1179066595a1c2a78aa2b88bbe5c6365d54bc0' 
  AND token = 'b9QewzASHwNuJcDcX7i07eRGsl0t6D/kZF/F1AJC4/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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