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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33693bbb1a85da4ec1c48a846d32874ffcbe6e580e963effb1e70fd0403c40c4' 
  AND token = 'QV/+0xEPmY2/+GwcLSXngW/o7It62JMt++QI3A3nh4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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