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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'adc866cf87509b12c656ce2c25cd934e64305a4444cc06e401754fdf68826921' 
  AND token = 'vgVAZV6AzjO58hLzgL3t1iEmpFXh05O44sBQ964wPl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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