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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64b801f417c240d679c5cc6ecac7a0ecadbb3cf44efd5f4b275ce3e9037dd8ce' 
  AND token = 'ep25Puc6wW4XomFifxkdE3nyB0lyn3sIaxn6ankNwek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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