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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c69dbec0698a596c63f1ccc9668486c8cfe90ca7f37a0a5d689dcbb39511dc6e' 
  AND token = 'rKi/aC7yXLcwioT4zEpcIyrg69cgdx11nsAkL4vFgZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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