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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f01e635c5ef4f7df290ca0374991e3f177dff29b96bbe48ebc83ab24036647f' 
  AND token = 'cF3HjZ9RjK9hwYe0atT5z2hfoyMP2f/xHsrTmc3nEn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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