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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '51a75884cbf899c17a268938b02372f042181397a1be435b00362fd02338aebb' 
  AND token = 'mUAR7we6Lo2/+EuH/Ia1LLdVcNL/kQoIHPo2mwV1jTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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