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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88ca87cb350b9ecfe366da280a0b850b896bb074e0b367e64fc359e653a495e1' 
  AND token = 'IHgubb+ph8YIQ5l9wPh6EM0oQY+WQ7qwjsj9QV2wqig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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