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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '020d1a77b9d858c3da95436802dece7800a8dfbd4cc4c613349469c0d87bd0f5' 
  AND token = 'sV8LNSlKuwBnHW0vTYVcrWmmW2a4GyhcMPt16APvaHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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