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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67ef2f7911ca703cd53b5bdf3f8be6f620c5c51da0d7d9c25311a390a3e57050' 
  AND token = '8P4iqP/sV1O+OwD6biOeXT/tC4zxVh+U515vn3/CvSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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