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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be6d206d08e10c814cd44f45b95c73724d66f2f881d140205b54bc6679794bc6' 
  AND token = '26D9i6cVYBJGMNNK4qkVVyfdTdYq8X7Yhh3DzaJEJ40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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