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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c691b39a4446c88a2ba1efeefb42d9419852db9d27aafd271ee613439c6b527e' 
  AND token = 'w6Qf4j3ftVrOML3FjiKy7lgW0ST9ft+Ip50S70i1Xa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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