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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04cba9c088d66fb29589e10bc794c63f9fdb082a1f7a3bb86591b9eec3beedc4' 
  AND token = 'h2X6yUP7y8BnajenppRfktHEkQ+IQmB1pNiwcAbqGuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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