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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d3357f342626d2cd0ecedd1435d223e68267903b202b545298b66fd2ed24a65' 
  AND token = 'y0/Dd0F5he6A+JaY5kc13yIJSwJ58mXxOWjRXaIU3EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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