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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '005f559bf7330c630cf42f84343ebb9033903b82a38c07803bec01962435c797' 
  AND token = 'OsIsfI6aAeKd4iQab29yhMM7e7Sc0ghtRffdq2nxulU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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