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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f042e8ba16596f1dce0a4e9a6df430e75c416152c0c361c162be0e2b03e64ce' 
  AND token = 'zgEiDHjHsQcVjE3Gr6TdJJkAS0ShVh4P0rAHJpKQNzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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