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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b12bfb83f91b01a5661f4e6a0b0187e62bb5a06f20605b88c47df6bf55f66f9' 
  AND token = 'Iln9C/eg/8ST9cxRPgVvsRvUEJ6xNA4VMGmOheqsgPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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