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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7cb28e9656461d84a1d99f3606387991b603f56d821949701d94850957f40eeb' 
  AND token = '3kt7XxHcoHopNos88qpfzkIT+jkhWaKts4hlV+ZaE0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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