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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9771e2a317b40389bd4f655fc08384991f0d51a901ceef620633fdaba86590e8' 
  AND token = '31G2EULgTPt6tqOpu/NGsoPqkcfitZNTtRqBpv8kd4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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