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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c370478880b43dd6be2a52d23aba240ebbd09029df7e09af76ee566de25352e3' 
  AND token = 'FMPTtYPUEbmiokvZj5Ra8DhsASK9TR24Nq64YK1HY7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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