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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c2c0388b79e0ec8bfaf8497f937a7cd8f84e98729f1867e9133e22d9e8670be' 
  AND token = 'qeS7VMyuSymm/68GuscYywhyIv5bjJ5N0YMApmh619A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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