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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0be6aa1b44ad10f9e7109ba26a922cd2b89aa7ddee01dcb7af75217483a9e5c' 
  AND token = '8JHI6eKICDoHAQlJ63brlN0AuXN1rsjAFE0bySXKsNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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