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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a02001b24f1aa8c0ecd9a4d5f82bb92b483520f605544ce8977d1886a721311b' 
  AND token = 'YEC9h9FflEfy4L0qsCaT5uSlDPrnfY/GE/YO2edCyCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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