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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ffa985aa804c7a19c667a109663253eee928de8380b6026aa418bfffa61aac0' 
  AND token = 'R7Z48uB9Xct1gzRp8vG66KDrCD05tnop2cM8i3sp7nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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