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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5ced5cf9e6ca8c3fe2c804737cf923b73b5c94ac73c1fbc2106944c8af5d7fd' 
  AND token = '1myOaAeaReSllCYGkL0eStWhzMDuoXJxvU7ebXmfLwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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