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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1eccdcc85ec9e9477a2a417807a5b934d4cd93ca503462ed3e70c55cb21f90bc' 
  AND token = '4gGD+yUK3hyrTCD2368ooMSgp78XNXAyk6t0bAgOk+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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