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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5cf48292a8219f3f5ae15e06de8e110795a1b1022613cf29346f08ab04ea7c16' 
  AND token = 'AlAfeqpDDDWyem2WQzusw6PPN4Vc8Zl8lg4rDpPfnaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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