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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '635cf71f945747468ff51895dbbefda15ce8b077c0c8689c89641ee6ef53fde0' 
  AND token = 'Wq1AznUsoHBd+atRk/pu/FabnM1XSseEB+DHrfBg46g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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