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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9e8dde05a90816dd129b1b1a2f08eec7bed4fa3a4517e190f3ed9273bf34d9f' 
  AND token = 'gdZtihikDIMXvLObYU19tGGCQU9Uidy3Ul7dMP0/6d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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