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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a128e14a4566a8289256313351206012ef4d03f8eb6a317b25a085b6e490cf3f' 
  AND token = 'L9kxy9V/+ZRFoib21aEUEncDwe84mG8xt2jW074+OJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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