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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58b3b324792779aa1648f9b9b58bfe17196cdcd4e05265bc4de36bc375972212' 
  AND token = 'qP8Ybf2qtzAbAO2tNmjf8jlKHHg0Tz2VfWOU1xlDMgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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