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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '267821c6cc70ab058b0664ece86b481d46b746ccfa9f6fe53973fc59a5eb265d' 
  AND token = '0EPbhQuokw90sUeD/7n5zu3Lyd0rfzNIxZI5hPYKpQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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