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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20021d39d5e47310c32632ba4cd4e30f4979bbf6ab36a159503837288f972b6b' 
  AND token = '0mrAHwooWvLmoJcubf2AcooNrbRQmKLG7CcRnE0m9JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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