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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc5eea3b7b7c4d564e201b1dab74eaee934d627e142e6b8ad6b9f3cb6404de88' 
  AND token = 'G+7Yjl9dyr132medtZfzz17BFzMOCdzIDLKY6XghHg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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