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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e88ba2d245c17fb2251f8678c4a4bd0a0621187398f84a9d90a685011bb17d3e' 
  AND token = '48k2rC1QhKUz6cy1svdPN/pokOsE6LvJh3gm8cUyDjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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