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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06c2a73177d05dd103002b9ef92491cde4302c0ee55a2dc5924d5e41b70b7516' 
  AND token = 'vJLo5LTTMtfFlQURmV+BVJl6yUCIb5dsrbs6H1dKrmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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