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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e0ff713d23ecd9cadf8c82fe4c671eac905f427e9caf473a27f3c217fa2a524' 
  AND token = '78DshprqMsnZH1I8XAOnqrv7jalkgTBa+E3qG+PQfCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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