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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ceafc2f6ab1a3c7d1d49de64f9a7bdc10b84fb69d017b1f3ecca76d4f1b2821' 
  AND token = 'L1r9QyG0KFmWg+8da0Nl79BeleRqalZZNpv9d052hUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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