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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52941c60bd3ae76eb556c73ec5810347ba31b95f771e73ad8b9d68fcad038306' 
  AND token = 'efloW/07lSMhf9lCCEMWwhBnRNYFtz5bW3yyjqwIJ1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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