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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2088c0608b4502a962fd3d2779ec24cee29a615f92513b3392f6d7f7a15d4720' 
  AND token = 'dsW6CUW0awEKNKYHrtgX6V7jbVvAiWjNgH0No7yVlVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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