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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '120fe3e2cf7b8cdda4d4d619810b47d5596ffbf929fc574edb0206e91caff1ac' 
  AND token = 'Rvi43UUbOE7KtZ+yfPG8FnvptfCzy2n1T2Bw3HpKJdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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