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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9064cae8361e1e8035850a59757f913e3cb8047fbdbe1ad4dd0b312550cb3f4' 
  AND token = 'ngukDF253i5kFe7SzyOd0ih42zYPzsE22TVIWnflUQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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