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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4e7bee78c48bd9d8a7f2c398b175b8e83d8dbbd67b47a00fd7aaeddfe13a790' 
  AND token = 'a7CL9Xyw5z5nMpundCjpv5vCOI2iEiajHlLDk53o2BQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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