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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '820d8bee5dcaf45914d84bc6fdd8cdff058500073b8e2a0fa4b1745d3b73d1cf' 
  AND token = 'ynccmGyPjDA4gWwiZr8TxdmcZ9HHX4UiDYOrPDyeV8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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