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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '336f5cde84281f2fd486a03ae0fc2cd012678e84c12f0f580c5b49bb41959eab' 
  AND token = 'e14Yw4S4chK+nTSTjFvKa0d46sn3bGimdQmHwTbjxyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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