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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '642103a268e338a11ad35efa68249cfd78b5e304c44925a29718d4e89951f06d' 
  AND token = 'Nnt9YS83Jxg+YRksR4rQB3IVE7rHktO2JKSOgl8DuLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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