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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83327dc18bc8702a6d8f4a027cdc71b60a9ecec091573e618a0e3d299b461578' 
  AND token = 'am0jUUYQtm9/R7J03dNP0n6eboYkmDsd4dVQnERgSP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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