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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4075921185e467dc22a3d811649a506388affba34e956e2aa0754ac0f1797a94' 
  AND token = '4Z8ufq1aHWX08p4BGo82Bgbl2gj4kaYcWsPEDy4Dido=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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