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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c260c437393b0dd33bb9cfa100ab6864d1ea8778e6c40ab543150442f7880ec' 
  AND token = 'J3lhbX+L1NMU7LV5rcL7XIgSMsY8bU1LU2RxnByaXao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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