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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dca226bcf3ff3e16e6c0f951d8e5eb2c207473b0fa1868f1ede6787880e51a60' 
  AND token = '55O8ALZQkT/extGMqgFuUDi3c02xTizzQwOpS6ezJEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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