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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e983a71ff6bfdf83d010808bb042bb4d5e69a6b58db22e9e90b6c328dc1d01fd' 
  AND token = 'yBRpUvEaGMt/bQWLs4NuXTNTilhzOC5mgGH6GneYMMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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