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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c68697bd9a4babae34382c28a0ba6f463c264c2741b2ae5462dbe35a119545a' 
  AND token = 'kF4vBjynAQCklXebMvO6GmEjkbU5DMoWH1nN/CrfIJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00120

JSON explain

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