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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c42d903d17fc01f20de6468acbf568006bf79965040dc2419198ef42dded538' 
  AND token = 'rD2LdiciPyphNmbuHQlCfu7/xgaW30CnZjn+W3sVhO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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