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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '520ed57d9eb2a6b1fb294aa6f819f3aae509c615b3b504ec165127c6732c39a9' 
  AND token = 'Y4fneWHbrQvDtM1znaAiBwqE77zwZpWwclHqobczxf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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